Patents by Inventor Rengaswamy Srinivasan

Rengaswamy Srinivasan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20210277278
    Abstract: Coating compositions include a binder that has a first polymeric material that does not undergo ultraviolet (UV) degradation and/or does not absorb UV radiation/light. The coating compositions may further include at least a first UV-reflective pigment dispersed throughout the binder. The coating compositions may be provided in a cured form as a solid coating layer that may overly at least a portion of a substrate.
    Type: Application
    Filed: March 3, 2020
    Publication date: September 9, 2021
    Inventors: Jason J. Benkoski, Rengaswamy Srinivasan, Christopher M. Hoffman, Jr., Keith S. Caruso
  • Patent number: 11067635
    Abstract: An example battery cell diagnostic apparatus is provided that may include control circuitry, a current source, measurement circuitry, and a first and a second multiplexer. The control circuitry may be configured to control the first multiplexer to electrically connect the measurement circuitry to a battery cell and control the second multiplexer to electrically connect the current source to the battery cell to apply a current, output from the current source, at each of a set of frequencies to the battery cell. The control circuitry may also be configured to receive measurements from the measurement circuitry at each of the frequencies, which may include respective frequencies that correlate to an electrolytic resistance of the battery cell, an anode impedance of the battery cell, and a cathode impedance of the battery cell. Similar measurements may also be taken for each cell in a battery.
    Type: Grant
    Filed: December 5, 2018
    Date of Patent: July 20, 2021
    Assignee: The Johns Hopkins University
    Inventors: Rengaswamy Srinivasan, Bliss G. Carkhuff
  • Patent number: 10953464
    Abstract: Functionalized metallic feedstock and three-dimensional articles formed therefrom via an additive manufacturing process are provided. The functionalized metallic feedstock includes a plurality of discrete metallic substrates including a first metallic substrate having a first surface area, in which at least a portion of the first surface area comprises a functionalizing agent selected to render the first metallic substrate resistant to corrosion.
    Type: Grant
    Filed: November 21, 2017
    Date of Patent: March 23, 2021
    Assignee: The Johns Hopkins University
    Inventors: Steven M. Storck, Rengaswamy Srinivasan, Paul J. Biermann
  • Publication number: 20210078107
    Abstract: Metal ceramic composites, or metallic matrix composites (MMCs), may be formed by additive manufacturing (AM) processing of powder beds including a plurality of metallic particles of one or more metals and a plurality of ceramic particles of one or more ceramic materials. The presence of the ceramic particles during the AM process changes the optical properties and/or thermal conductivity of the powder bed since the ceramic particles have markedly different optical properties and/or thermal conductivity relative to metal particles. These optical properties and/or thermal conductivities of the ceramic particles can be tailored in different areas within a given layer of the powder bed to change energy absorption of an energy beam in the different areas. The resulting MMCs exhibit significantly improved performance characteristics, including increases in strength properties, while maintaining ductility and improvement of resistance to pitting and crevice corrosion, among others characteristics.
    Type: Application
    Filed: September 4, 2020
    Publication date: March 18, 2021
    Inventors: Steven M. Storck, Ian D. McCue, Michael C. Brupbacher, Rengaswamy Srinivasan
  • Patent number: 10818981
    Abstract: A method is provided. The method is executable by a processor of a battery management system. The method includes sending a first command signal to a multiplexer to cause the multiplexer to select a cell of a battery. The method also includes sending a second command signal to a current source to apply a current to the cell of the battery. The method also includes receiving measurement information based on the application of the current to the cell from a measurement circuit.
    Type: Grant
    Filed: September 16, 2019
    Date of Patent: October 27, 2020
    Assignee: The Johns Hopkins University
    Inventors: Rengaswamy Srinivasan, Bliss G. Carkhuff
  • Publication number: 20200014220
    Abstract: A battery cell evaluation apparatus is provided that includes a current source configured to output a current at a frequency, measurement circuitry, and control circuitry. The control circuitry may be configured to electrically connect a cell of a battery to the current source and the measurement circuitry to apply the current across terminals of the cell and receive a measurement of an impedance phase shift of the cell as phase shift data from the measurement circuitry. The control circuitry may also be configured to compare the phase shift data to a protection profile, and trigger a protection device to prevent damage to the battery based on the comparison of the phase shift data to the protection profile.
    Type: Application
    Filed: July 3, 2019
    Publication date: January 9, 2020
    Inventors: Rengaswamy Srinivasan, Bliss G. Carkhuff
  • Publication number: 20200014082
    Abstract: A method is provided. The method is executable by a processor of a battery management system. The method includes sending a first command signal to a multiplexer to cause the multiplexer to select a cell of a battery. The method also includes sending a second command signal to a current source to apply a current to the cell of the battery. The method also includes receiving measurement information based on the application of the current to the cell from a measurement circuit.
    Type: Application
    Filed: September 16, 2019
    Publication date: January 9, 2020
    Inventors: Rengaswamy Srinivasan, Bliss G. Carkhuff
  • Patent number: 10461374
    Abstract: A method is provided. The method is executable by a processor of a battery management system. The method includes sending a first command signal to a multiplexer to cause the multiplexer to select a cell of a battery. The method also includes sending a second command signal to a current source to apply a current to the cell of the battery. The method also includes receiving measurement information based on the application of the current to the cell from a measurement circuit.
    Type: Grant
    Filed: June 27, 2017
    Date of Patent: October 29, 2019
    Assignee: The Johns Hopkins University
    Inventors: Rengaswamy Srinivasan, Bliss G. Carkhuff
  • Patent number: 10381635
    Abstract: A method of preparing a high capacity nanocomposite cathode of FeF3 in carbon pores may include preparing a nanoporous carbon precursor, employing electrochemistry or solution chemistry deposition to deposit Fe particles in the carbon pores, reacting nano Fe with liquid hydrofluoric acid to form nano FeF3 in carbon, and milling to achieve a desired particle size.
    Type: Grant
    Filed: June 7, 2017
    Date of Patent: August 13, 2019
    Assignee: The Johns Hopkins University
    Inventors: Jeremy D. Walker, Jeffrey P. Maranchi, Edward D. Russell, Jennifer L. Sample, Marcia W. Patchan, Lance M. Baird, Rengaswamy Srinivasan
  • Publication number: 20190170829
    Abstract: An example battery cell diagnostic apparatus is provided that may include control circuitry, a current source, measurement circuitry, and a first and a second multiplexer. The control circuitry may be configured to control the first multiplexer to electrically connect the measurement circuitry to a battery cell and control the second multiplexer to electrically connect the current source to the battery cell to apply a current, output from the current source, at each of a set of frequencies to the battery cell. The control circuitry may also be configured to receive measurements from the measurement circuitry at each of the frequencies, which may include respective frequencies that correlate to an electrolytic resistance of the battery cell, an anode impedance of the battery cell, and a cathode impedance of the battery cell. Similar measurements may also be taken for each cell in a battery.
    Type: Application
    Filed: December 5, 2018
    Publication date: June 6, 2019
    Inventors: Rengaswamy Srinivasan, Bliss G. Carkhuff
  • Patent number: 10224715
    Abstract: A power routing device includes processing circuitry configured to receive inputs from device monitors configured to determine load status information from a plurality of loads, power-source monitors configured to determine source status information from a plurality of power sources, and command modules configured to provide context information regarding the loads or the power sources. Some of the loads have different operational characteristics than others. Some of the power sources have different operational characteristics than others. The power routing device is operably coupled to power-source distribution hardware selectively operably coupling selected ones of the power sources to selected ones of the loads. The power routing device is configured to direct the power-source distribution hardware to define routing between the selected ones of the power sources and the selected ones of the loads based on the source status information, the load status information and the context information.
    Type: Grant
    Filed: November 21, 2016
    Date of Patent: March 5, 2019
    Assignee: The Johns Hopkins University
    Inventors: Rengaswamy Srinivasan, Lakshminarayan Srinivasan
  • Publication number: 20190031886
    Abstract: A coating system may be configured to be applied to an aluminum-magnesium substrate of an object. The coating system may include a primer configured to reduce the corrosion rate of the aluminum-magnesium substrate and a topcoat configured to resist water and improve solar reflectance of the coating system. The primer may include a silicate and a first additive configured to increase corrosion resistance of the coating system The topcoat may include a siloxane and a second additive configured to reduce solar absorptance of the coating system.
    Type: Application
    Filed: March 29, 2018
    Publication date: January 31, 2019
    Inventors: Jason J. Benkoski, Christopher M. Hoffman, JR., Rengaswamy Srinivasan, Keith S. Caruso
  • Publication number: 20180141120
    Abstract: Functionalized metallic feedstock and three-dimensional articles formed therefrom via an additive manufacturing process are provided. The functionalized metallic feedstock includes a plurality of discrete metallic substrates including a first metallic substrate having a first surface area, in which at least a portion of the first surface area comprises a functionalizing agent selected to render the first metallic substrate resistant to corrosion.
    Type: Application
    Filed: November 21, 2017
    Publication date: May 24, 2018
    Inventors: Steven M. Storck, Rengaswamy Srinivasan, Paul J. Biermann
  • Publication number: 20180145506
    Abstract: A power routing device includes processing circuitry configured to receive inputs from device monitors configured to determine load status information from a plurality of loads, power-source monitors configured to determine source status information from a plurality of power sources, and command modules configured to provide context information regarding the loads or the power sources. Some of the loads have different operational characteristics than others. Some of the power sources have different operational characteristics than others. The power routing device is operably coupled to power-source distribution hardware selectively operably coupling selected ones of the power sources to selected ones of the loads. The power routing device is configured to direct the power-source distribution hardware to define routing between the selected ones of the power sources and the selected ones of the loads based on the source status information, the load status information and the context information.
    Type: Application
    Filed: November 21, 2016
    Publication date: May 24, 2018
    Inventors: Rengaswamy Srinivasan, Lakshminarayan Srinivasan
  • Patent number: 9966769
    Abstract: A battery charging monitor is provided including a non-invasive sensor electrically connected to at least one battery cell of at least one battery, which is configured to measure an internal temperature of the at least one battery cell. The non-invasive internal temperature sensor is connected to the microcontroller that is configured to determine a rate of change of the internal temperature of the at least one battery cell based on the internal temperature of the at least one battery cell, determine a state of charge of the at least one battery cell based on the rate of change of the internal temperature, and cause a charging rate to be applied, by a battery charger, to the at least one battery cell based on the determined state of charge.
    Type: Grant
    Filed: March 28, 2016
    Date of Patent: May 8, 2018
    Assignee: The Johns Hopkins University
    Inventors: Rengaswamy Srinivasan, Bliss G. Carkhuff, Lakshminarayan Srinivasan
  • Publication number: 20170370998
    Abstract: A method is provided. The method is executable by a processor of a battery management system. The method includes sending a first command signal to a multiplexer to cause the multiplexer to select a cell of a battery. The method also includes sending a second command signal to a current source to apply a current to the cell of the battery. The method also includes receiving measurement information based on the application of the current to the cell from a measurement circuit.
    Type: Application
    Filed: June 27, 2017
    Publication date: December 28, 2017
    Inventors: Rengaswamy Srinivasan, Bliss G. Carkhuff
  • Publication number: 20170271647
    Abstract: A method of preparing a high capacity nanocomposite cathode of FeF3 in carbon pores may include preparing a nanoporous carbon precursor, employing electrochemistry or solution chemistry deposition to deposit Fe particles in the carbon pores, reacting nano Fe with liquid hydrofluoric acid to form nano FeF3 in carbon, and milling to achieve a desired particle size.
    Type: Application
    Filed: June 7, 2017
    Publication date: September 21, 2017
    Inventors: Jeremy D. Walker, Jeffrey P. Maranchi, Edward D. Russell, Jennifer L. Sample, Marcia W. Patchan, Lance M. Baird, Rengaswamy Srinivasan
  • Patent number: 9705124
    Abstract: A method of preparing a high capacity nanocomposite cathode of FeF3 in carbon pores may include preparing a nanoporous carbon precursor, employing electrochemistry or solution chemistry deposition to deposit Fe particles in the carbon pores, reacting nano Fe with liquid hydrofluoric acid to form nano FeF3 in carbon, and milling to achieve a desired particle size.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: July 11, 2017
    Assignee: The Johns Hopkins University
    Inventors: Jeremy D. Walker, Jeffrey P. Maranchi, Edward D. Russell, Jennifer L. Sample, Marcia W. Patchan, Lance M. Baird, Rengaswamy Srinivasan
  • Publication number: 20170149256
    Abstract: A battery charging monitor is provided including a non-invasive sensor electrically connected to at least one battery cell of at least one battery, which is configured to measure an internal temperature of the at least one battery cell. The non-invasive internal temperature sensor is connected to the microcontroller that is configured to determine a rate of change of the internal temperature of the at least one battery cell based on the internal temperature of the at least one battery cell, determine a state of charge of the at least one battery cell based on the rate of change of the internal temperature, and cause a charging rate to be applied, by a battery charger, to the at least one battery cell based on the determined state of charge.
    Type: Application
    Filed: March 28, 2016
    Publication date: May 25, 2017
    Inventors: Rengaswamy Srinivasan, Bliss G. Carkhuff, Lakshminarayan Srinivasan
  • Patent number: 9550855
    Abstract: A metallic microcapsule containing a polymeric microcapsule having one or more polymeric precursors encapsulated therein; and a metallic shell enclosing a volume containing the polymeric microcapsule is disclosed. Also disclosed is a self-healing coating composition comprising (a) a film-forming binder; and (b) metallic microcapsules, the metallic microcapsules being the same or different and containing a polymeric microcapsule containing one or more polymeric precursors encapsulated therein; and a metallic shell enclosing a volume containing the polymeric microcapsule.
    Type: Grant
    Filed: April 11, 2011
    Date of Patent: January 24, 2017
    Assignee: The Johns Hopkins University
    Inventors: Jason J. Benkoski, Rengaswamy Srinivasan, Jeffrey P. Maranchi